This happened some time ago when I updated to a later version of the engine. Either 4.7 or 4.10. The lines render SUPER faintly and are almost completely invisible when I move.
Any ideas? Sorry for crappy image. Can’t show much of my game 
Geezus…just needed to increase the thickness. Don’t know why I only tried now. It used to work with the defaults! Kind of annoying cause some functions like DrawDebugCone doesn’t take line thickness as a param 